/*
 * @(#)BufferUtil.java	1.0 Mar 8, 2008
 *
 *	The MIT License
 *
 *	Copyright (c) 2008 Malachi de AElfweald <malachid@gmail.com>
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *	THE SOFTWARE.
 */
package org.eoti.io;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.io.IOException;

public class BufferUtil
{
	public static ByteBuffer createByteBuffer(
		StringBuilder content,
		Charset charset,
		boolean direct)
	throws IOException
	{
		return createByteBuffer(content.toString(), charset, direct);
	}

	public static ByteBuffer createByteBuffer(
		String content,
		Charset charset,
		boolean direct)
	throws IOException
	{
		CharBuffer chars = CharBuffer.allocate(content.length());
		chars.put(content);
		chars.flip();
		return createByteBuffer(chars, charset, direct);
	}

	public static ByteBuffer createByteBuffer(
		CharBuffer content,
		Charset charset,
		boolean direct)
	throws IOException
	{
		ByteBuffer buffer = charset.newEncoder().encode(content);
		if(direct) return createDirectByteBuffer(buffer);
		return buffer;
	}

	public static ByteBuffer createDirectByteBuffer(ByteBuffer buf)
	{
		ByteBuffer directBuffer = ByteBuffer.allocateDirect(buf.limit());
		directBuffer.put(buf);
		return directBuffer;
	}

	public static ByteBuffer copy(ByteBuffer src, int startInclusive, int endInclusive)
	{
		int length = endInclusive - startInclusive + 1;
		if(endInclusive == -1)
			length = src.limit();

		byte[] buf = new byte[length];
		src.get(buf, startInclusive, length);

		ByteBuffer dest;
		if(src.isDirect()) dest = ByteBuffer.allocateDirect(length);
		else dest = ByteBuffer.allocate(length);
		dest.put(buf);
		return dest;
	}
}